Global warming (sun heating), Acid rain, Pollution, Solar power (like solar panels), Ozone layer, Natural resources, Ecological/ Eco-friendly/ Green, Endangered species, Fumes, Wildlife, Deforestation, Fossil fuels, Greenhouse effect, Litter/ Rubbish, Overpopulation, Melting ice caps, Renewable energy, Climate change, Rising sea levels, Cut down on plastic bags,

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